I agree with Spidey. Both Mariko and Yukio had strong accents, but they were great. All of the Japanese cast had accents. I don't think that she was dubbed. It seems more likely that she was told to try and do an American accent and wasn't used to doing one, so it sounded weird.

It definitely looks like she was dubbed, most of the time the words coming out didnt fit with her mouth movements. As others have said it wouldnt cover up a bad performance so I would still love to know why they did it.

Maybe she pulled a Daniel-Day Lewis and hissed all her lines & slithered around the floor all the time. Imagine how weird that would have been at the catering table.

"yeah I wanted some more roast potatoes but ****ing Svetlana was wrapped around the bowl hissing and trying to bite me and ****. Plus she kept writhing her bare feet on the pigs n blankets tray. I love those things but **** that."

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"That was the edge Parker had; he knew that survival was more important than heroics. It isn't how you play the game, it's whether you win or lose.”
~ Richard Stark, Deadly Edge

When everyone mentioned the dubbing, I watched out for it on the second viewing and didn't see any signs of lips and words not matching at all. I was studying her mouth so much I nearly developed a squint.

Same with First Class when Beast's mouth supposedly didn't match the words. It was fine in the version of the movie I saw.

Are people watched leaked workprint versions downloaded from torrent sites or something? Because what I saw in the cinema looked fine.

__________________Show me an X-Men comic where Mystique is the leader and walks round all day as a bored blonde